Compilare: user.cpp: In function ‘bool solve()’: user.cpp:63:18: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[100000]’ [-Wformat=] scanf("%s",&a); ^ user.cpp:64:18: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[100000]’ [-Wformat=] scanf("%s",&b); ^ user.cpp:63:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&a); ^ user.cpp:64:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&b); ^ user.cpp: In function ‘int main()’: user.cpp:112:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("twosets.in","r",stdin); ^ user.cpp:113:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:114:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^